:root {
    --color-primary: #6d28d9;
    --color-primary-dark: #4c1d95;
    --color-accent: #22c55e;
    --color-surface: #f6f7ff;
    --color-text: #0f172a;
    --rgb-primary: 109,40,217;
    --rgb-accent: 34,197,94;

    --radius-sm: 10px;
    --radius-md: 18px;
    --radius-lg: 26px;
    --radius-xl: 34px;

    --shadow-sm:
        0 1px 0 rgba(15,23,42,.03),
        0 6px 18px rgba(var(--rgb-primary), .10);
    --shadow-md:
        0 1px 0 rgba(15,23,42,.03),
        0 10px 30px rgba(var(--rgb-primary), .13),
        0 2px 10px rgba(34,197,94,.08);
    --shadow-lg:
        0 1px 0 rgba(15,23,42,.03),
        0 18px 55px rgba(var(--rgb-primary), .16),
        0 7px 22px rgba(34,197,94,.10);

    --space-section: 4rem;
    --space-card: 1.5rem;
    --space-gap: 1.25rem;
    --transition: 420ms cubic-bezier(0.16, 1, 0.3, 1);
    --heading-weight: 700;
    --body-line-height: 1.7;
}

body { color: var(--color-text); line-height: var(--body-line-height); }
h1, h2, h3, h4 { font-weight: var(--heading-weight); }
section, .section { padding-top: var(--space-section); padding-bottom: var(--space-section); }

.card, [class*="card"] {
    border-radius: var(--radius-lg);
    box-shadow:
        0 1px 0 rgba(15,23,42,.02),
        0 10px 26px rgba(var(--rgb-primary), .12),
        0 3px 14px rgba(34,197,94,.10);
    padding: var(--space-card);
    transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition), background var(--transition), color var(--transition);
}

.btn, button[class*="btn"], a[class*="btn"] {
    border-radius: var(--radius-md);
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition), color var(--transition), opacity var(--transition);
}

a:not([class]) {
    color: var(--color-primary);
    transition: color var(--transition), text-shadow var(--transition), opacity var(--transition);
    text-shadow: 0 0 0 rgba(0,0,0,0);
}

/* ========== Section Layout Variants ========== */

/* news: featured-left */
/* 左大右小 (1大+2小) */
                .news-grid { display: grid; grid-template-columns: 2fr 1fr; grid-template-rows: auto auto; gap: var(--space-gap); }
                .news-grid > *:first-child { grid-row: span 2; }

/* features: horizontal */
/* 水平滚动 */
                .feature-list { display: flex; gap: var(--space-gap); overflow-x: auto; scroll-snap-type: x mandatory; }
                .feature-list > * { flex: 0 0 300px; scroll-snap-align: start; }

/* hero: left-aligned */
.hero-content { text-align: left; max-width: 600px; }

/* testimonials: masonry */
.testimonial-list { column-count: 2; column-gap: var(--space-gap); }
                .testimonial-list > * { break-inside: avoid; margin-bottom: var(--space-gap); }

/* partners: centered */
.partner-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }

/* faq: two-column */
.faq-list { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-gap); }

/* stats: big-number */
/* 大数字居中 */
                .stats-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 2rem; }
                .stats-grid .stat-value { font-size: 3rem; }

/* cta: split */
.cta-inner { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 2rem; }

/* Page Layout: narrow-centered */
/* 窄版居中 */
            .page-main { max-width: 860px; margin: 0 auto; }

/* 条件性装饰 */
.card:hover, [class*="card"]:hover {
    transform: translateY(-6px);
    box-shadow:
        0 1px 0 rgba(15,23,42,.02),
        0 22px 70px rgba(var(--rgb-primary), .18),
        0 10px 28px rgba(34,197,94,.12);
    transition-duration: 520ms;
}

.card {
    border: 1px solid rgba(var(--rgb-primary), .14);
    background:
        linear-gradient(180deg, rgba(255,255,255,.84) 0%, rgba(246,247,255,.55) 100%);
    backdrop-filter: blur(6px);
}

header, .header, .navbar {
    background:
        radial-gradient(1200px 260px at 15% 0%, rgba(var(--rgb-primary), .08), rgba(255,255,255,0) 55%),
        radial-gradient(900px 220px at 85% 0%, rgba(var(--rgb-accent), .10), rgba(255,255,255,0) 60%),
        transparent;
}

/* Responsive */
@media (max-width: 1024px) {
    .news-grid { grid-template-columns: repeat(2, 1fr) !important; }
    .feature-list { grid-template-columns: repeat(2, 1fr) !important; }
    .partner-grid { grid-template-columns: repeat(3, 1fr) !important; }
    .stats-grid { grid-template-columns: repeat(2, 1fr) !important; }
    .hero-inner { grid-template-columns: 1fr !important; }
}
@media (max-width: 640px) {
    :root { --space-section: 2rem; --space-card: 1rem; --space-gap: 0.75rem; }
    .news-grid { grid-template-columns: 1fr !important; }
    .feature-list { grid-template-columns: 1fr !important; }
    .faq-list { grid-template-columns: 1fr !important; }
    .testimonial-list { column-count: 1 !important; }
    .partner-grid { grid-template-columns: repeat(2, 1fr) !important; }
    .stats-grid { grid-template-columns: repeat(2, 1fr) !important; }
    .cta-inner { grid-template-columns: 1fr !important; }
}